content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * ----------------------
   * PieDatasetHandler.java
   * ----------------------
   * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 23-Jan-2003 : Version 1 (DG);
   *
   */
  
  package org.jfree.data.xml;
  
  import org.jfree.data.general.DefaultPieDataset;
  import org.jfree.data.general.PieDataset;
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  import org.xml.sax.helpers.DefaultHandler;
  
  /**
   * A SAX handler for reading a {@link PieDataset} from an XML file.
   */
  public class PieDatasetHandler extends RootHandler implements DatasetTags {
  
      /** The pie dataset under construction. */
      private DefaultPieDataset dataset;
  
      /**
       * Default constructor.
       */
      public PieDatasetHandler() {
          this.dataset = null;
      }
  
      /**
       * Returns the dataset.
       *
       * @return The dataset.
       */
      public PieDataset getDataset() {
          return this.dataset;
      }
  
      /**
       * Adds an item to the dataset under construction.
       *
       * @param key  the key.
       * @param value  the value.
       */
      public void addItem(Comparable key, Number value) {
          this.dataset.setValue(key, value);
      }
  
      /**
       * Starts an element.
       *
       * @param namespaceURI  the namespace.
       * @param localName  the element name.
       * @param qName  the element name.
       * @param atts  the element attributes.
       *
       * @throws SAXException for errors.
       */
      @Override
      public void startElement(String namespaceURI,
                               String localName,
                               String qName,
                               Attributes atts) throws SAXException {
  
          DefaultHandler current = getCurrentHandler();
          if (current != this) {
              current.startElement(namespaceURI, localName, qName, atts);
          }
          else if (qName.equals(PIEDATASET_TAG)) {
              this.dataset = new DefaultPieDataset();
          }
          else if (qName.equals(ITEM_TAG)) {
              ItemHandler subhandler = new ItemHandler(this, this);
              getSubHandlers().push(subhandler);
              subhandler.startElement(namespaceURI, localName, qName, atts);
          }
  
      }
  
      /**
       * The end of an element.
       *
       * @param namespaceURI  the namespace.
       * @param localName  the element name.
       * @param qName  the element name.
       *
       * @throws SAXException for errors.
       */
      @Override
      public void endElement(String namespaceURI,
                             String localName,
                             String qName) throws SAXException {
  
          DefaultHandler current = getCurrentHandler();
          if (current != this) {
              current.endElement(namespaceURI, localName, qName);
          }
  
      }
  
  }
  